medical_servicesSurgery Prep

GLP-1 + Surgery

GLP-1 medications slow gastric emptying — which becomes a real problem under anesthesia. The American Society of Anesthesiologists issued specific guidance in 2023. Here's the practical version.

The short answer

If you're having elective surgery or any procedure requiring sedation or general anesthesia, the American Society of Anesthesiologists (ASA) 2023 consensus guidance recommends holding weekly GLP-1 medications (semaglutide, tirzepatide) for at least one week before the procedure, and daily versions (liraglutide) for at least the day of. The reason: GLP-1s slow stomach emptying, and a partially-full stomach during anesthesia raises the risk of aspiration (stomach contents entering the lungs).

What to know

When you're sedated, the reflexes that normally keep food and acid out of your airway are suppressed. Anesthesiologists rely on a known "fasting interval" — typically 6 to 8 hours without solid food — to ensure the stomach is empty before they place a breathing tube. GLP-1 medications can keep food in the stomach far longer than that, sometimes for 12-24 hours or more, even when you've followed the standard NPO (nothing by mouth) instructions perfectly.

The ASA's June 2023 consensus statement was the first major society guidance to formalize this. It recommends pausing weekly GLP-1s for at least one week before the procedure (covering more than half of one dosing interval) and daily GLP-1s on the day of the procedure. For patients with diabetes who depend on the medication for glycemic control, the team may keep it going and instead extend the fasting window or use point-of-care gastric ultrasound to check stomach contents before induction.

This is not a reason to panic or to quit your medication. It's a reason to tell your surgeon and your anesthesiologist that you're on a GLP-1 as soon as your procedure is on the calendar. They will give you a specific hold protocol. Do not improvise — the timing matters, especially for tirzepatide and semaglutide, which have half-lives of about 5 to 7 days.

Planning the pause

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Tell every provider

Surgeon, anesthesiologist, primary care, and the prescriber of your GLP-1 should all know about the upcoming procedure. They'll align on the hold schedule.

schedule

Hold at least 1 week (weekly drugs)

Per ASA 2023: skip the dose 7+ days before the procedure for semaglutide and tirzepatide. For daily liraglutide, hold the morning dose on the day of surgery.

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Consider a clear-liquid day prior

Many anesthesia teams now ask GLP-1 patients to do 24 hours of clear liquids before the procedure, even with the hold, to further empty the stomach.

Common questions

Common Concerns

What happens if I forgot to tell them and took my dose this week?expand_more

Tell them now — even on the day of. The anesthesia team may delay the procedure, switch to gastric ultrasound to check stomach contents, extend your fasting window, or use a different airway protocol. Surgery may still proceed; they just need accurate information to do it safely.

Does this apply to dental work and colonoscopies?expand_more

Any procedure requiring sedation (deep sedation, general anesthesia, MAC) carries the same aspiration risk. Routine dental cleanings with no sedation do not require pausing. For IV-sedation dental work or screening colonoscopy, follow the ASA hold guidance.

When can I restart my GLP-1 after surgery?expand_more

Most clinicians resume the medication once you're tolerating regular food, your nausea from surgery has resolved, and you're medically stable — typically a few days to a week post-op. Restart at your previous dose unless your provider directs otherwise.

Will I lose progress from missing one dose?expand_more

Very little. Semaglutide and tirzepatide have long half-lives (~5-7 days), so blood levels drop gradually. One skipped dose for surgery has minimal impact on appetite or weight trajectory once you resume.

What if my surgery is for diabetes-related reasons and I can't safely stop?expand_more

The ASA guidance specifically notes that for patients where stopping the GLP-1 isn't safe (significant glycemic risk), the team can keep the medication and instead use a longer fasting period plus gastric ultrasound assessment. This is a shared decision with your endocrinologist and anesthesiologist.

Keep exploring

Browse all GLP-1 guides.